In the blink of an eye, it was March of '91, and the cold of the early spring season had not subsided, but the factory of NORINCO Group was full of warmth, and the workers were pointing around several brand-new machine tools, and a few people were still walking forward to touch with their hands.

"This is the CNC machine tool that Mr. Liu always talks about? Good guy, it is really much more than our manual machine tool, and there is a "warehouse" next to it. ”

A worker said to the man next to him.

"Warehouse? Are you confused? That's the control system, although we haven't used this equipment, but Mr. Liu told us a lot, and the warehouse?

The other said with disdain.

"You really don't have a sense of humor, I don't know it's the control system?"

The other party pouted and replied.

"Mr. Du is here, Mr. Du, how much is this CNC machine?

Juniper walked in from outside, and everyone hurriedly asked.

"Of course it's not cheap, more than 3 million yuan each, and these units are more than 16 million yuan in total!"

"What? more than 16 million, so expensive?"

Everyone gasped.

"Let me calculate, my annual income is more than 12,000 yuan, more than 16 million, even if he is 16 million, I will have to use more than 1,400 years to earn, more than 1,400 years, Mom, from the Qing Dynasty to the present is less than a thousand years, right?"

A man was taken aback by the fact that he had calculated the account.

"Qing Dynasty? How many years has the Qing Dynasty been? Yours have no culture since the Tang Dynasty, there is really no culture!"

The other one was clearly better than his historian.

Juniper said with a smile on the side.

"In fact, the price of these CNC machine tools in foreign countries is not high, one is only more than 100,000 US dollars, converted into about 1 million yuan, but sold to us as high as more than 3 million, do you know why?"

"Why?"

The crowd asked.

"It's very simple, because we can't make it, our NORINCO machine tool is the best, but there is also a generation gap with CNC machine tools.

And let me tell you, these CNC machine tools are only the products of West Germany ten years ago, can only be used as lathes, they now have a turning, grinding integrated CNC machine tools, and higher precision, can make a lot of parts that we can not imagine.

We can't make it ourselves, we still need it very much, so we can only buy it from the other party at a high price, not to mention three million, even four million have to endure it, if we are backward, we have to be beaten, and if we are backward, we have to be slaughtered, this is the reality, there is no way!"

Juniper's words silenced everyone, and that's true.

"How awesome is this? We can't make it?"

One worker was a little unconvinced.

"You can take a look!"

At this time, Liu Lang walked in from outside, and the "big brother" in his hand had just been hung up by him, and then he put it aside.

"Mr. Liu is here!"

Liu Lang was wearing a jacket, this dress was bought when he went to the United States last month, Fucheng is rare, at this time he is more than one meter six, this height is already considered an adult standard, even in the North Industries Group is not the shortest person, this height has completely exceeded Liu Lang's previous life of the same age, even compared with some junior high school students, it is not too much worse.

The height of one meter six can not be seen at all the appearance of an eleven-year-old child, of course, this is not unusual, many sixth-grade boys in Liu Lang's previous life can grow to one meter seven, but it is a little rare in this era, after all, the food in this era cannot be compared with more than twenty years later.

Liu Lang came to a machine tool, asked the workers to connect the power supply, and then took the raw materials and put them on the operating table.

I saw that after Liu Lang carried out a series of operations on the operation panel, the cutter head began to rotate, and the knife was moved against the rough embryo material.

Everyone was watching, they were now experienced industrial workers, and they had a very keen sense of the knife path, even if the knife was just doing the simplest cut, it was an eye-opener for them.

"Sure enough, it's much more accurate, and the accuracy must be improved at least ten times more, amazing!"

"High-tech is high-tech, cow!"

Everyone was amazed.

After a while, the machine stopped, and Liu Lang picked up the rough embryo and put it in front of everyone, and the carvings were breathtaking.

"It's really precise, convinced, why is this machine so powerful?"

Everyone has never seen a CNC machine tool, but they have heard of it before, but it is better to see it than to see it, and today they were immediately impressed when they saw it.

"I know that the toolpath control of CNC machine tools is carried out by computer programs, and the computer, of course, is much more powerful than our human brain. ”

Juniper explained.

"Computer? Not only the computer, you see this tool, but also the body of the entire CNC machine tool, from design to casting, completely surpassing us. ”

Another worker touched the machine and admired.

Liu Lang's eyes lit up when he heard this, and it seemed that his workers had begun to master the essence of machine tools.

"That's right, the reason why CNC machine tools are extremely accurate, control is one thing, but this is only one aspect, one is the design of the machine tool, which is the soul of the precision of the machine tool, this machine tool looks nothing special, but the precision is high, durable, and its grasp of the design details is perfect.

The second is the machine tool casting, a machine tool casting is the bone, is the key to bear the cutting torque force and dispersed vibration force, is the basis of the stability of the whole machine. High-precision machine tools, without good castings, even the best spindle screw guide, the accuracy of the whole machine will be lost after a year.

The third is that the control system determines the key accuracy of the machine tool, that is, the so-called computer control, the accuracy of the machine tool refers to the shape, mutual position and relative motion of the main components of the machine tool, including geometric accuracy, transmission accuracy, motion accuracy, positioning accuracy and accuracy retention and other aspects.

All kinds of machine tools can be divided into ordinary precision level, precision level and high precision level according to the accuracy.

The above three precision grades of machine tools have corresponding precision standards, and their tolerances are roughly proportioned to one to zero point four to zero point two five if the tolerance is one to ordinary level, and the accuracy of the machine tool is mainly improved from the precision distribution of the machine tool in the design stage, the selection of components and materials.

The first is geometric accuracy, which refers to the accuracy of the shape, mutual position and relative motion of the main components when the machine tool is not moving (the machine tool spindle does not rotate or the worktable does not move, etc.) or the movement speed is low. Such as the straightness of the guide rail, the radial runout and axial movement of the spindle, the parallelism or perpendicularity of the spindle centerline to the moving direction of the slide table, etc. Geometric accuracy directly affects the accuracy of the processed workpiece, which is the basic index to evaluate the quality of the machine tool. It is mainly determined by the quality of structural design, manufacturing and assembly.

Then there is the motion accuracy, which refers to the accuracy of the main parts of the machine tool when moving at the speed of the working state. For example, the rotation accuracy of high-speed rotary spindles. For high-speed and precision machine tools, motion accuracy is an important index to evaluate the quality of machine tools. Motion accuracy and geometric accuracy are different. It is also affected by the speed of motion (rotational speed), the gravitational force of moving parts, the force of transmission, and the frictional force. It is related to factors such as structural design and manufacturing.

The second is the transmission accuracy, which refers to the coordination and accuracy of the relative movement between the end effectors of the machine tool transmission system. This error becomes the transmission error of the transmission chain, such as when the lathe is turning the thread, every rotation of the spindle, the movement of the tool holder should be equal to the lead of the dry thread. But in fact, because there is an error in the transmission chain between the spindle and the tool holder, the actual moving distance of the tool holder and the error are the transmission error of the lathe threaded drive chain. The transmission accuracy is determined by the design of the transmission system, the error of the ideal moving distance, and the manufacturing and assembly accuracy of the transmission parts. ”

Liu Lang took this opportunity to explain the mystery of the accuracy of CNC machine tools.

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